Short for intercrural sex, a non-penetrative form of intercourse that's increasingly popular amongst gay men. The male will place his penis between his receiving partner's thighs - usually with lubrication - and thrust to create friction. Among men who have sex with men, intercrural sex is also referred to as the "Princeton First-Year", the "Oxford Style", "Oxford Rub", or the "Ivy League Rub".

Noun: a friend who is usually only called upon by a friend when a more primary/prominent friend is unavailable.

Taken from the term “second string” in an athletic competition situation. In football, if the star quarterback gets injured during a play, the second string is called off the bench to replace him/her. A “Second String Friend” is essentially benched until needed, if ever.

Synonyms: Plan B, Second Choice, Secondary Friend, Benched Until Needed